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(gimp-message-set-handler 1)

The Procedure Browser shows that the arguments '1' has an equivalent (C style)
name of GIMP_CONSOLE. In Script-Fu you remove the leading GIMP_ from named
constants shown in the Procedure Browser and change any remaining _ to -. That
would mean you could use

(gimp-message-set-handler CONSOLE)

which has the extra benefit of being more readable. You don't have to go back
to the procedure browser to find out what the 1 means.

Just a suggestion to use the named constants where available to make the
scripts a little more readable, save some trips back to the procedure browser
which should make any needed debugging a little less tedious.